Isabella of England was an English princess of the House of Plantagenet. She became Holy Roman Empress, Queen of Sicily, Italy and Germany from 1235 until her death as the third wife of Emperor Frederick II.

Isabella was Queen of England from 1200 to 1216 as the second wife of King John, Countess of Angoulême in her own right from 1202 until her death in 1246, and Countess of La Marche from 1220 to 1246 as the wife of Count Hugh.